METHOD FOR RECEIVING DOWNLINK CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR

• US 20150230210A1
• Filed: 09/17/2013
• Published: 08/13/2015
• Est. Priority Date: 09/17/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Seungmin, Seo, Hanbyul
• Granted Patent: US 9,769,811 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04J 11/0079 Acquisition of downlink reference signals, e.g. detection of cell-ID
• CPC Class Codes: H04L 27/2656 Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/00 Wireless channel access

Abstract

The present invention relates to a method by which a terminal receives downlink control information in a wireless communication system and, more specifically, the method comprises the step of receiving a specific reference signal (RS) in a common search space (CSS) of an enhanced physical downlink control channel (EPDCCH), wherein the specific reference signal is punctured and transmitted when a position allocated to a first terminal in an initial access procedure cannot be commonly applied to a second terminal.

Claims

1. A method for receiving downlink control information by a first user equipment (UE) in a wireless communication system, the method comprising:

receiving a specific reference signal in a common search space (CSS) of an enhanced physical downlink control channel (EPDCCH),

wherein the specific reference signal is transmitted using a puncturing (PC) scheme if a location allocated to the first UE in an initial access procedure is not commonly applicable to a second UE.

2. The method according to claim 1, wherein the specific reference signal is a channel state information reference signal (CSI-RS).

3. The method according to claim 2, further comprising performing channel measurement based on the CSI-RS and transmitting a resultant value of the channel measurement.

4. The method according to claim 1, wherein the specific reference signal is a CSI-RS pre-configured for channel estimation or radio resource management (RRM).

5. The method according to claim 1, further comprising configuration information of the specific reference signal.

6. The method according to claim 1, wherein the specific reference signal is transmitted using a rate matching (RM) scheme if the location allocated to the first UE in the initial access procedure is commonly applicable to the second UE.

7. A method for receiving downlink control information by a user equipment (UE) in a wireless communication system, the method comprising receiving downlink control information of an enhanced physical downlink control channel (EPDCCH),

wherein the downlink control information is received after a specific orthogonal frequency division multiplexing (OFDM) symbol location is configured as a start OFDM symbol location of a common search space (CSS) in an initial access procedure.

8. The method according to claim 7, wherein control information of OFDM symbols prior to the start OFDM symbol location of the CSS is assumed as being punctured.

9. A method for receiving downlink information by a user equipment (UE) in a wireless communication system, the method comprising receiving downlink information of an enhanced physical downlink control channel (EPDCCH),

wherein the downlink control information is allocated in a first direction and a second direction based on a specific orthogonal frequency division multiplexing (OFDM) symbol location of a subframe,

wherein the first direction is defined from the specific OFDM symbol location toward a last OFDM symbol of the subframe, and

wherein the second direction is defined from the specific OFDM symbol location toward an initial OFDM symbol of the subframe.

10. The method according to claim 9, wherein the specific OFDM symbol location of the subframe is determined using a predefined number of blind decoding operations.

11. A user equipment (UE) for receiving downlink information in a wireless communication system, the UE comprising:

a radio frequency (RF) unit; and

a processor,

wherein the processor is configured to receive a specific reference signal in a common search space (CSS) of an enhanced physical downlink control channel (EPDCCH), and

wherein the specific reference signal is configured to be transmitted using a puncturing (PC) scheme if a location assigned to the UE in an initial access procedure is not commonly applicable to another UE.